Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (52,023)	$ (47,667)	$ (32,718)
Other comprehensive (loss) income:
Foreign currency translation	(9)	(7)	8
Total comprehensive loss	$ (52,032)	$ (47,674)	$ (32,710)